So to update about Orsha and Klaipeda quests.
Like said before, you can access the Klaipeda region from Letas Stream to Gateway of the Great King. However, Saule’s portal doesn’t work so you’ll have to run through Sunset Flag Forest. You can pick up any sidequests though.
If you started in Orsha, you’re able to go back to Klaipeda and start the main quest. However, the quest basically jumps back down to Level 7 and rewards you Level 1 EXP Cards, but you can continue with the story and get the Revelations. Eventually, you’ll have access to both main questlines, and I expect Orsha’s questline to stop around 115, but I still have to check that out.
The Level 65 map is where the Orsha Main questline continues, and where I was when I took the screenshot!
You also have access to every side quest. Heck, I even went to West Siauliai Woods and I could do the entire tutorial.
I’d expect this is the same for any characters beginning in Klaipeda as well.